The patch titled
Subject: mm, slab: rename kmalloc-node cache to kmalloc-<size>
has been removed from the -mm tree. Its filename was
mm-slab-rename-kmalloc-node-cache-to-kmalloc-size.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm, slab: rename kmalloc-node cache to kmalloc-<size>
SLAB as part of its bootstrap pre-creates one kmalloc cache that can fit the
kmem_cache_node management structure, and puts it into the generic kmalloc
cache array (e.g. for 128b objects). The name of this cache is "kmalloc-node",
which is confusing for readers of /proc/slabinfo as the cache is used for
generic allocations (and not just the kmem_cache_node struct) and it appears as
the kmalloc-128 cache is missing.
An easy solution is to use the kmalloc-<size> name when pre-creating the cache,
which we can get from the kmalloc_info array.
Example /proc/slabinfo before the patch:
...
kmalloc-256 1647 1984 256 16 1 : tunables 120 60 8 : slabdata 124 124 828
kmalloc-192 1974 1974 192 21 1 : tunables 120 60 8 : slabdata 94 94 133
kmalloc-96 1332 1344 128 32 1 : tunables 120 60 8 : slabdata 42 42 219
kmalloc-64 2505 5952 64 64 1 : tunables 120 60 8 : slabdata 93 93 715
kmalloc-32 4278 4464 32 124 1 : tunables 120 60 8 : slabdata 36 36 346
kmalloc-node 1352 1376 128 32 1 : tunables 120 60 8 : slabdata 43 43 53
kmem_cache 132 147 192 21 1 : tunables 120 60 8 : slabdata 7 7 0
After the patch:
...
kmalloc-256 1672 2160 256 16 1 : tunables 120 60 8 : slabdata 135 135 807
kmalloc-192 1992 2016 192 21 1 : tunables 120 60 8 : slabdata 96 96 203
kmalloc-96 1159 1184 128 32 1 : tunables 120 60 8 : slabdata 37 37 116
kmalloc-64 2561 4864 64 64 1 : tunables 120 60 8 : slabdata 76 76 785
kmalloc-32 4253 4340 32 124 1 : tunables 120 60 8 : slabdata 35 35 270
kmalloc-128 1256 1280 128 32 1 : tunables 120 60 8 : slabdata 40 40 39
kmem_cache 125 147 192 21 1 : tunables 120 60 8 : slabdata 7 7 0
[vbabka@xxxxxxx: export the whole kmalloc_info structure instead of just a name accessor, per Christoph Lameter]
Link: http://lkml.kernel.org/r/54e80303-b814-4232-66d4-95b34d3eb9d0@xxxxxxx
Link: http://lkml.kernel.org/r/20170203181008.24898-1-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slab.c | 3 ++-
mm/slab.h | 6 ++++++
mm/slab_common.c | 5 +----
3 files changed, 9 insertions(+), 5 deletions(-)
diff -puN mm/slab.c~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size mm/slab.c
--- a/mm/slab.c~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size
+++ a/mm/slab.c
@@ -1288,7 +1288,8 @@ void __init kmem_cache_init(void)
* Initialize the caches that provide memory for the kmem_cache_node
* structures first. Without this, further allocations will bug.
*/
- kmalloc_caches[INDEX_NODE] = create_kmalloc_cache("kmalloc-node",
+ kmalloc_caches[INDEX_NODE] = create_kmalloc_cache(
+ kmalloc_info[INDEX_NODE].name,
kmalloc_size(INDEX_NODE), ARCH_KMALLOC_FLAGS);
slab_state = PARTIAL_NODE;
setup_kmalloc_cache_index_table();
diff -puN mm/slab.h~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size mm/slab.h
--- a/mm/slab.h~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size
+++ a/mm/slab.h
@@ -71,6 +71,12 @@ extern struct list_head slab_caches;
/* The slab cache that manages slab cache information */
extern struct kmem_cache *kmem_cache;
+/* A table of kmalloc cache names and sizes */
+extern const struct kmalloc_info_struct {
+ const char *name;
+ unsigned long size;
+} kmalloc_info[];
+
unsigned long calculate_alignment(unsigned long flags,
unsigned long align, unsigned long size);
diff -puN mm/slab_common.c~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size mm/slab_common.c
--- a/mm/slab_common.c~mm-slab-rename-kmalloc-node-cache-to-kmalloc-size
+++ a/mm/slab_common.c
@@ -915,10 +915,7 @@ struct kmem_cache *kmalloc_slab(size_t s
* kmalloc_index() supports up to 2^26=64MB, so the final entry of the table is
* kmalloc-67108864.
*/
-static struct {
- const char *name;
- unsigned long size;
-} const kmalloc_info[] __initconst = {
+const struct kmalloc_info_struct kmalloc_info[] __initconst = {
{NULL, 0}, {"kmalloc-96", 96},
{"kmalloc-192", 192}, {"kmalloc-8", 8},
{"kmalloc-16", 16}, {"kmalloc-32", 32},
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-page_alloc-remove-redundant-checks-from-alloc-fastpath.patch
mm-page_alloc-dont-check-cpuset-allowed-twice-in-fast-path.patch
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